CN219302659U - Transmitting module and laser radar - Google Patents
Transmitting module and laser radar Download PDFInfo
- Publication number
- CN219302659U CN219302659U CN202223125441.3U CN202223125441U CN219302659U CN 219302659 U CN219302659 U CN 219302659U CN 202223125441 U CN202223125441 U CN 202223125441U CN 219302659 U CN219302659 U CN 219302659U
- Authority
- CN
- China
- Prior art keywords
- beam combining
- light
- reflecting
- prism
- axis direction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The utility model is suitable for the technical field of laser radars and provides a transmitting module and a laser radar. The transmitting module comprises a polarized light source, a quartz wire, a collimating lens, a half wave plate and a polarized beam combining component which are sequentially arranged along the optical axis direction; the quartz wire is used for carrying out the emission view angle reduction treatment on the light rays in the fast axis direction; the collimating lens is used for collimating the light transmitted by the quartz wire to form collimated light; the collimated light rays comprise first light rays and second light rays which are distributed in sequence along the slow axis direction; the polarization beam combining component comprises a beam combining surface and a reflecting surface which are sequentially arranged along the slow axis direction, and the reflecting surface is used for receiving and reflecting the second light outputted by the half-wave plate; the beam combining surface is used for allowing one of the first light ray and the second light ray reflected by the reflecting surface to pass through, and is also used for receiving and reflecting the other light ray. The transmitting module and the laser radar provided by the utility model can simultaneously consider the resolution and the miniaturization design requirement.
Description
Technical Field
The utility model belongs to the technical field of laser radars, and particularly relates to a transmitting module and a laser radar.
Background
The laser radar is a radar system for detecting the characteristic quantities of the position, the speed and the like of a target by emitting laser beams, and the working principle is as follows: and then, the received signal (target echo) reflected from the target is compared with the emission signal, and after proper processing, the related information of the target, such as parameters of target distance, azimuth, altitude, speed, gesture, shape and the like, can be obtained, so that the targets of vehicles, planes, missiles and the like are detected, tracked and identified.
In the field of laser radars, the size of the outgoing light spot can affect the measurement resolution of the laser radar, and the focal length of the collimating lens can affect the size of the outgoing light spot. The method is characterized in that the larger the focal length of the collimating lens is, the smaller the emergent light spot is, the higher the resolution of the laser radar is, but at the same time, the larger the light path occupied space is, so that the miniaturization of the laser radar is not facilitated.
Disclosure of Invention
The utility model aims to provide a transmitting module and a laser radar, and aims to solve the technical problem that the resolution and miniaturization of the laser radar cannot be simultaneously considered in the prior art.
The utility model is realized in such a way, in a first aspect, the utility model provides an emission module, which comprises a polarized light source, a quartz wire, a collimating lens, a half wave plate and a polarized beam combining component which are sequentially arranged along the optical axis direction;
the polarized light source comprises at least one laser emitter, and the polarized direction of light rays emitted by the polarized light source is parallel to any one of the fast axis direction and the slow axis direction;
the cross section of the quartz wire is circular, the axial direction of the quartz wire is parallel to the direction of the slow axis, and the quartz wire is used for allowing light rays emitted by the polarized light source to pass through and performing emission field angle reduction treatment on the light rays in the direction of the fast axis;
the collimating lens is used for collimating the light transmitted by the quartz wire to form collimated light; the collimated light rays comprise first light rays and second light rays which are distributed in sequence along the slow axis direction;
the half-wave plate is used for allowing the second light to pass through and enabling the polarization direction of the second light to rotate by 90 degrees;
the polarization beam combining component comprises a beam combining surface and a reflecting surface which are sequentially arranged along the slow axis direction, and the reflecting surface is used for receiving and reflecting the second light outputted by the half-wave plate; the beam combining surface is parallel to the reflecting surface and is used for allowing one of the first light ray and the second light ray reflected by the reflecting surface to pass through, and is also used for receiving and reflecting the other one of the first light ray and the second light ray reflected by the reflecting surface so as to enable the second light ray to at least partially overlap with the first light ray.
In one embodiment, the polarization beam combining assembly comprises a polarization beam combining element and a reflecting element, wherein the polarization beam combining element and the reflecting element are sequentially arranged along the slow axis direction, the polarization beam combining element is provided with the beam combining surface, and the reflecting element is provided with the reflecting surface.
In one embodiment, the polarization beam combining element and the reflecting element are prisms, and the two prisms are connected to form a prism group.
In one embodiment, the polarization beam combining element is a beam combining four-prism, the beam combining four-prism is provided with a light incident surface, a light emergent surface and a joint surface connected with the reflecting element, a beam combining layer is arranged on a diagonal surface of the beam combining four-prism, which is intersected with the light incident surface and the joint surface in a straight line, and the light emergent surface of the beam combining layer is the beam combining surface; the reflecting element is a right-angle triangular prism, one right-angle surface of the right-angle triangular prism is a light incident surface, the other right-angle surface is connected with the connecting surface of the beam combining four-prism, a reflecting layer is formed on the inclined surface of the right-angle triangular prism, and one surface of the reflecting layer, which is close to the beam combining surface, is the reflecting surface;
or the polarization beam combining element is a beam combining prism, one surface of the beam combining prism is a light incident surface, a beam combining layer is arranged on an inclined surface connected with the light incident surface, and the light emergent surface of the beam combining layer is the beam combining surface; the reflecting element is a parallelogram prism, one surface of the parallelogram prism is a light incident surface, one surface of the parallelogram prism, which is connected with the light incident surface and is close to the beam combining triple prism, is connected with the beam combining surface, a reflecting layer is formed on one surface, which is parallel to the beam combining surface and is arranged opposite to the beam combining surface, and one surface, which is close to the beam combining surface, of the reflecting layer is the reflecting surface.
In one embodiment, the polarization beam combining element and the reflecting element are made of the same material.
In one embodiment, the two sides of the polarizing beam combining element that meet the reflecting element are the same shape and size.
In one embodiment, the surface shape of the collimating lens may be a spherical surface or an aspherical surface.
In one embodiment, the quartz wire has a diameter of 100-300 μm and a length of 0.5-5mm.
In one embodiment, the width of the first light ray and the width of the second light ray are the same in the slow axis direction.
In a second aspect, a lidar is provided, which includes a receiving module and a transmitting module provided in each of the foregoing embodiments.
Compared with the prior art, the utility model has the technical effects that: the emission module provided by the embodiment of the utility model comprises a polarized light source, a quartz wire, a collimating lens, a half wave plate and a polarized beam combination assembly which are sequentially arranged along the direction of an optical axis, wherein the quartz wire is used for allowing light rays emitted by the polarized light source to pass through and performing emission view angle reduction treatment on the light rays in the direction of a fast axis; the half wave plate is used for allowing the second light to pass through and enabling the polarization direction of the second light to rotate by 90 degrees; the polarization beam combining component comprises a beam combining surface and a reflecting surface which are sequentially arranged along the slow axis direction, and the reflecting surface is used for receiving and reflecting the second light outputted by the half-wave plate; the beam combining surface is parallel to the reflecting surface and is used for allowing the first light to pass through and receiving and reflecting the second light reflected by the reflecting surface so as to enable the second light to at least partially overlap with the first light. On one hand, the quartz wire can be used for carrying out the reduction treatment on the emission field angle in the fast axis direction on the light rays emitted by the polarized light source, thereby being beneficial to reducing the diameter of the collimating lens; on the other hand, the combination of the half wave plate and the polarization beam combination component can reduce the light spot size of the polarized light source with polarization without increasing the size of the collimating lens, thereby being beneficial to improving the resolution of the laser radar. Therefore, the transmitting module provided by the embodiment of the utility model is beneficial to simultaneously considering the resolution and the miniaturization design requirement of the laser radar.
It will be appreciated that the advantages of the second aspect may be found in the relevant description of the first aspect, and will not be described in detail herein.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following description will briefly explain the embodiments of the present utility model or the drawings used in the description of the prior art, and it is obvious that the drawings described below are only some embodiments of the present utility model, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a structure and an optical path of a transmitting module according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of a structure and an optical path of a transmitting module according to another embodiment of the present utility model;
FIG. 3 is a schematic top view of the emission module shown in FIG. 2;
FIG. 4 is a schematic diagram of a polarization beam combining assembly according to an embodiment of the present utility model;
FIG. 5 is a schematic diagram of a polarization beam combining assembly according to another embodiment of the present utility model.
Reference numerals illustrate:
100. a polarized light source; 200. quartz wire; 300. a collimating lens; 400. a half-wave plate; 500. a polarization beam combining assembly; 510. combining the beam surfaces; 520. a reflecting surface; 530. a polarization beam combining element; 540. a reflective element; 600. an optical axis; 700. a target area; 710. a first region; 720. a second region; l (L) 1 A first ray; l (L) 2 A second ray; d1, the width of the first light ray; d2, the width of the second light ray; x, slow axis direction; y, fast axis direction; z, optical axis direction.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar components or components having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.
In the description of the present utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between the two components or interaction relationship between the two components. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent.
Noun interpretation:
1. fast axis and slow axis
The fast and slow axes of the laser light source are for Far-field (i.e., far-field of the laser).
The fast axis is perpendicular to the front surface of the laser source (laser chip) and the slow axis is parallel to the surface of the laser chip. The length can be perpendicular T, and the short length is parallel T. The divergence angle of the fast axis is generally larger than that of the slow axis, and the divergence angle of the fast axis is basically more than 3 times of that of the slow axis of the high-power laser chip.
Lidar generally includes a transmitting module and a receiving module. The transmitting module is used for transmitting detection light into a detection target or a detection area, and the receiving module is used for receiving echo light formed after the detection light is reflected by an obstacle in the detection target or the detection area. In order to solve the foregoing problems, an embodiment of the present utility model provides a transmitting module.
Referring to fig. 1 and 2, the emission module includes a polarized light source 100, a quartz wire 200, a collimating lens 300, a half-wave plate 400, and a polarization beam combining assembly 500 sequentially disposed along an optical axis direction Z.
The polarized light source 100 includes at least one laser emitter, and the polarization direction of the light emitted by the polarized light source 100 is parallel to either one of the fast axis direction Y and the slow axis direction X. The polarized light source 100 in this embodiment may be composed of one or more laser transmitters, where the laser transmitter used in this embodiment is any laser transmitter capable of emitting polarized light, and the polarization direction of the light is parallel to the slow axis direction X or the fast axis direction Y. Specifically, when the polarized light source emits P polarized light, the polarization direction of the P polarized light is parallel to the slow axis direction; when the polarized light source emits S polarized light, its polarization direction is parallel to the fast axis direction Y.
As shown in fig. 3, the quartz wire 200 has a circular cross section, and an axial direction is parallel to the slow axis direction X, for passing the light emitted from the polarized light source 100, and performing an emission angle-of-view reduction process on the light in the fast axis direction Y. The quartz wire 200 in this embodiment may be an integrally formed structure, or may be formed by splicing two quartz wires 200 with semicircular cross sections, which may be flexibly selected according to the use requirement, and is not limited only herein.
The collimating lens 300 is used to collimate the light transmitted through the quartz wire 200 into collimated light. The collimated light comprises first light rays l distributed in sequence along the slow axis direction X 1 And a second ray l 2 . The collimating lens 300 in this embodiment may be a convex lens, or a combination of a plurality of lenses, and may be specifically and flexibly selected according to the use requirement, which is not limited only herein. As shown in fig. 1, the slow axis direction X in the present embodiment is a direction parallel to the paper surface and perpendicular to the optical axis direction Z, and the fast axis direction Y is a direction perpendicular to the slow axis direction X and the optical axis direction Z, respectively, i.e., a direction perpendicular to the paper surface.
The half-wave plate 400 is used for providing a second light ray l 2 Pass through and make the second light ray l 2 Is rotated by 90 deg.. The wafer optical axis and the second light ray l of the half-wave plate 400 in the present embodiment 2 An included angle of 45 DEG is formed in the vibration direction of the half-wave plate 400, so that the second light ray l passing through the half-wave plate 2 The polarization direction of (1) is rotated by 90 DEG, i.e. if the second light ray l 2 The light with P polarization is converted into S polarization after passing through the half-wave plate 400, if the second light ray l 2 The S polarized light is preceded by a conversion to P polarized light after passing through half-wave plate 400.
The polarization beam combining assembly 500 includes a reflecting surface 520 and a beam combining surface 510, wherein the reflecting surface 520 is used for receiving and reflecting the second light ray l output by the half-wave plate 400 2 The method comprises the steps of carrying out a first treatment on the surface of the The beam combining surface 510 is used for providing a first light beam l 1 And a second light ray l reflected by the reflecting surface 520 2 One of the light rays passes through and is also used for receiving and reflecting the first light ray l 1 And a second light ray l reflected by the reflecting surface 520 2 To make the second light ray l 2 And the first light ray l 1 At least partially overlapping.
Specifically, the beam combining plane 510 in this embodiment may be capable of passing P-polarized lightThe polarization plane of the reflected S-polarized light may be a polarization plane through which the S-polarized light passes and which reflects the P-polarized light. The beam combining surface 510 is used for providing a first light beam l 1 And a second light ray l reflected by the reflecting surface 520 2 One of the light rays passes through and is also used for receiving and reflecting the first light ray l 1 And a second light ray l reflected by the reflecting surface 520 2 The other light ray in (a) is that, when the beam combining plane 510 is a plane of polarization through which the P-polarized light passes and reflects the S-polarized light, the light ray emitted by the polarized light source is the P-polarized light, the first light ray l is provided 1 Pass through, reflect the second light ray l reflected by the reflecting surface 520 2 The method comprises the steps of carrying out a first treatment on the surface of the When the beam combining surface 510 is a polarizing surface through which P polarized light passes and reflects S polarized light, and the light emitted by the polarized light source is S polarized light, the second light l reflected by the reflecting surface 520 2 Pass through, reflect the first light ray l 1 The method comprises the steps of carrying out a first treatment on the surface of the When the beam combining surface 510 is a polarizing surface through which the S-polarized light passes and reflects the P-polarized light, and the light emitted by the polarized light source is the P-polarized light, the second light l reflected by the reflecting surface 520 2 Pass through, reflect the first light ray l 1 The method comprises the steps of carrying out a first treatment on the surface of the When the beam combining plane 510 is a plane of polarization allowing the S-polarized light to pass through and reflecting the P-polarized light, the light emitted by the polarized light source is the S-polarized light, the first light l is provided 1 Pass through, reflect the second light ray l reflected by the reflecting surface 520 2 。
For convenience of description, the working principle of the transmitting module provided by the embodiment of the present utility model will be described by taking the beam combining plane 510 as a polarizing plane capable of allowing P polarized light to pass through and reflecting S polarized light, and taking light emitted by the polarized light source as P polarized light as an example:
as shown in fig. 1, a polarized light source 100 emits polarized light, the polarized light is pre-collimated by a quartz wire 200, the emission viewing angle in the fast axis direction Y of the polarized light is compressed, the partially compressed polarized light is collimated by a collimating lens 300, the light in the fast axis and slow axis directions of the polarized light are collimated to form collimated light, and a part of the collimated light (i.e. a first light l 1 ) Directly through the beam combining surface 510 into the target area 700; another part of the collimated light (i.e. the second light ray l 2 ) Warp yarnThe polarization direction of the half wave plate 400 (i.e. the half wave plate) is rotated by 90 degrees, and then the light is reflected by the reflecting surface 520 to the beam combining surface 510, and then reflected by the beam combining surface 510 to reach the target area 700.
The target area 700 includes a first area 710 and a second area 720 sequentially arranged along the slow axis direction X. When the first light ray l 1 Is wider than the second ray l 2 When d1 > d2, the light rays irradiated into the first region 710 are the first light rays l 1 The light irradiated into the second region 720 is the first light l 1 And a second ray l 2 Is a mixed light of (a) and (b); when the first light ray l 1 Is smaller than the second ray l 2 When d1 < d2, the light rays irradiated into the first region 710 are the second light rays l 2 The light irradiated into the second region 720 is the first light l 1 And a second ray l 2 Is a mixed light of (a) and (b); when the first light ray l 1 Is equal to the width of the second ray l 2 When the width of the target area 700 is equal to d1=d2, that is, when the area of the first area 710 is 0 and only the second area 720 remains, the area of the target area 700 is the smallest, and the light spot of the light emitted from the emitting module is the smallest. The first light ray l 1 And a second ray l 2 The width of (a) refers to the width of the light ray in the slow axis direction X. First ray l in the above process 1 The second light ray l after passing through the half-wave plate 400 is P polarized light 2 Is S polarized light.
In the above process, on one hand, the effect of the light passing through the quartz wire 200 is equal to the effect of the light passing through the biconvex cylindrical lens, so that the light emitted by the polarized light source 100 can be reduced in the emission viewing angle in the fast axis direction Y before passing through the collimating lens 300, so that the size of the collimating lens 300 is not required to be excessively large, and the miniaturized design of the emitting module and the laser radar is facilitated. On the other hand, due to the arrangement of the half-wave plate 400 and the polarization beam combining assembly 500, a portion of the light (i.e., the second light l) emitted from the polarized light source 100 can be changed 2 ) Polarization direction and propagation direction of the first light ray l 1 And a second ray l 2 At least partially overlap, thereby reducing emission of the emission moduleThe light spot size in the direction X of the slow axis of the light rays further enables the light spot size corresponding to the light rays emitted by the emission module to be integrally reduced.
In summary, the emission module provided in the embodiment of the present utility model includes the polarized light source 100, the quartz wire 200, the collimating lens 300, the half-wave plate 400 and the polarization beam combining assembly 500 sequentially disposed along the optical axis direction Z, wherein the quartz wire 200 is used for passing the light emitted by the polarized light source 100 and performing the emission angle-of-view reduction processing on the light in the fast axis direction Y; the half-wave plate 400 is used for providing a second light ray l 2 Pass through and make the second light ray l 2 Is rotated by 90 °; the polarization beam combining assembly 500 includes a beam combining surface 510 and a reflecting surface 520 sequentially arranged along the slow axis direction X, the reflecting surface 520 is configured to receive and reflect the second light ray l output through the half-wave plate 400 2 The method comprises the steps of carrying out a first treatment on the surface of the The beam combining surface 510 is parallel to the reflecting surface 520 for providing a first light beam l 1 Pass through and also serve to receive and reflect the second light ray l reflected by the reflecting surface 520 2 So that the second light ray l 2 And the first light ray l 1 At least partially overlapping. On the one hand, the quartz wire 200 can be used for performing the reduction treatment of the emission field angle in the fast axis direction Y on the light rays emitted by the polarized light source 100, which is beneficial to reducing the diameter of the collimating lens 300; on the other hand, by using the combination of the half-wave plate 400 and the polarization beam combining assembly 500, the size of the light spot corresponding to the light emitted by the emitting module can be reduced without increasing the size of the collimating lens 300, which is beneficial to improving the resolution of the laser radar. Therefore, the transmitting module provided by the embodiment of the utility model is beneficial to simultaneously considering the resolution and the miniaturization design requirement of the laser radar.
As shown in fig. 1 and 2, in an alternative embodiment, the polarization beam combining assembly 500 includes a polarization beam combining element 530 and a reflecting element 540 disposed sequentially along the slow axis direction X, the polarization beam combining element 530 having a beam combining surface 510, and the reflecting element 540 having a reflecting surface 520. Specifically, the polarization beam combining element 530 may employ a polarization beam combiner (polarizing beam splitter, PBS) or a thin film polarizer (Thin Film Polarizer). The reflecting element 540 may be a reflecting mirror, a reflecting prism, or the like, as long as the above-described functions can be achieved, and is not limited only. The polarization beam combining elements 530 in this embodiment may be disposed in a mutually connected or spaced arrangement, and may be specifically determined according to the specific structures of the polarization beam combining elements 530 and the reflecting elements 540. The polarization beam combining assembly 500 adopts the structure provided by the embodiment, and has simple structure and convenient assembly.
There are various arrangements of the polarization beam combining element 530 and the reflecting element 540, and in an alternative embodiment, as shown in fig. 2, the polarization beam combining element 530 and the reflecting element 540 are prisms, and the two elements are connected to form a prism group. The polarization beam combining element 530 and the reflecting element 540 in this embodiment may be connected by gluing or fixing, and may be flexibly selected according to the use requirement. With this structure, the polarization beam combining assembly 500 is formed into a single assembly, which is convenient to install and transport.
In one particular embodiment, as shown in FIG. 4, the polarization beam combining element 530 is a beam combining four prism. The beam combining four prisms are provided with a light incident surface, a light emergent surface and a connecting surface connected with the reflecting element. And a beam combining layer is arranged on a diagonal plane intersecting the light incident surface and the connecting surface in the beam combining four prism. The light-emitting surface of the beam combining layer is a beam combining surface 510. Specifically, one of the side surfaces of the beam combining four-prism is placed perpendicular to the optical axis 600, is disposed close to the collimating lens 300, is a light incident surface, and is connected to the light incident surface, and the surface close to the right-angle three-prism is a connection surface, and the surface opposite to the light incident surface is a light emergent surface. The beam combining four prisms in this embodiment may be formed by splicing two prisms, and the beam combining layer may be a beam combining coating formed on any prism inclined plane, or a beam combining film attached to any prism inclined plane, which may be specifically selected flexibly according to the use requirement.
The reflective element 540 is a right triangular prism. One of right angle faces of the right angle triangular prism is a light incident face, and the other right angle face is connected with the junction face of the beam combining four-prism. The inclined surface of the right-angle triangular prism is provided with a reflecting layer, and one surface of the reflecting layer, which is close to the beam combining surface 510, is a reflecting surface 520. The reflective layer in this embodiment may be a reflective film attached to the inclined plane of the right-angle triangular prism, or a reflective coating coated on the inclined plane of the right-angle triangular prism, which may be specifically and flexibly selected according to the use requirement, and is not limited only herein. The polarization beam combining element 530 and the reflecting element 540 adopt the structure provided by the embodiment, and the structure is simple and convenient for assembly.
In another embodiment, as shown in fig. 5, the polarization beam combining element 530 is a beam combining prism, one of the surfaces of the beam combining prism is a light incident surface, and a beam combining layer is disposed on an inclined surface connected to the light incident surface, and the light emergent surface of the beam combining layer is a beam combining surface 510. Specifically, the beam combining prism may be a right-angle prism, or may be another prism. When the right-angle prism is adopted, the shape of the polarization beam combining component 500 formed by the reflecting element 540 is more regular. The beam combining layer in this embodiment may be a beam combining coating formed on the inclined plane of the beam combining prism, or a beam combining film attached to the inclined plane of the beam combining prism, which may be specifically and flexibly selected according to the use requirement.
The reflecting element 540 is a parallelogram prism, one surface of the parallelogram prism is a light incident surface, one surface of the parallelogram prism, which is connected with the light incident surface and is close to the beam combining triple prism, is connected with the beam combining surface 510, a reflecting layer is formed on one surface, which is parallel to the beam combining surface 510 and is arranged opposite to the beam combining surface, and one surface of the reflecting layer, which is close to the beam combining surface 510, is a reflecting surface 520. The reflective layer in this embodiment may be a reflective film attached to the inclined plane of the right-angle triangular prism, or a reflective coating coated on the inclined plane of the right-angle triangular prism, which may be specifically and flexibly selected according to the use requirement, and is not limited only herein. The polarization beam combining element 530 and the reflecting element 540 adopt the structure provided by the embodiment, and the structure is simple and convenient for assembly.
Based on the above embodiments, the polarization beam combining element 530 and the reflecting element 540 are made of the same material. With this structure, the light entering the polarization beam combining element 530 from the reflecting element 540 can be prevented from changing its propagation direction, so that the light path is easy to set.
On the basis of the above embodiments, the two sides of the polarization beam combining element 530 and the reflecting element 540 that are in contact are identical in shape and size. With this structure, the polarization beam combining assembly 500 can be structured and has a small volume.
Based on the above embodiments, the surface shape of the collimating lens may be spherical or aspherical, that is, the collimating lens may be a spherical lens or an aspherical lens; when a spherical lens is adopted, the cost is low, and when an aspherical lens is adopted, the spherical lens has better curvature radius, can maintain good aberration correction and higher resolution, and simultaneously has smaller volume than the spherical lens.
On the basis of the above examples, the quartz wire has a diameter of 100-300 μm and a length of 0.5-5mm. By adopting the structure, the light in the fast axis direction can be ensured to be compressed through the quartz wire to realize the emission of the angle of view, and the quartz wire has smaller volume and multiple purposes.
In another embodiment of the present utility model, a lidar is further provided, which includes a receiving module and a transmitting module provided in each of the above embodiments. The transmitting module is used for transmitting detection light into a detection target or a detection area, and the receiving module is used for receiving echo light formed after the detection light is reflected by an obstacle in the detection target or the detection area.
The laser radar provided by the embodiment of the utility model comprises the transmitting module provided by the embodiments, so that the light spots irradiated to a detection target or a detection area are smaller, and the miniaturized design of the laser radar is facilitated, namely the resolution and the miniaturized design requirement of the laser radar are simultaneously considered.
The foregoing description of the preferred embodiments of the utility model has been presented only to illustrate the principles of the utility model and not to limit its scope in any way. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model, and other embodiments of the present utility model as will occur to those skilled in the art without the exercise of inventive faculty, are intended to be included within the scope of the present utility model.
Claims (10)
1. The emission module is characterized by comprising a polarized light source, a quartz wire, a collimating lens, a half wave plate and a polarized beam combining component which are sequentially arranged along the direction of an optical axis;
the polarized light source comprises at least one laser emitter, and the polarized direction of light rays emitted by the polarized light source is parallel to any one of the fast axis direction and the slow axis direction;
the cross section of the quartz wire is circular, the axial direction of the quartz wire is parallel to the direction of the slow axis, and the quartz wire is used for allowing light rays emitted by the polarized light source to pass through and performing emission field angle reduction treatment on the light rays in the direction of the fast axis;
the collimating lens is used for collimating the light transmitted by the quartz wire to form collimated light; the collimated light rays comprise first light rays and second light rays which are distributed in sequence along the slow axis direction;
the half-wave plate is used for allowing the second light to pass through and enabling the polarization direction of the second light to rotate by 90 degrees;
the polarization beam combining component comprises a beam combining surface and a reflecting surface which are sequentially arranged along the slow axis direction, and the reflecting surface is used for receiving and reflecting the second light outputted by the half-wave plate; the beam combining surface is parallel to the reflecting surface and is used for allowing one of the first light ray and the second light ray reflected by the reflecting surface to pass through, and is also used for receiving and reflecting the other one of the first light ray and the second light ray reflected by the reflecting surface so as to enable the second light ray to at least partially overlap with the first light ray.
2. The transmitting module of claim 1, wherein the polarization beam combining assembly comprises a polarization beam combining element and a reflecting element sequentially arranged along a slow axis direction, the polarization beam combining element having the beam combining surface, the reflecting element having the reflecting surface.
3. The transmitting module of claim 2, wherein the polarization beam combining element and the reflecting element are prisms, and are connected to form a prism group.
4. The transmitting module as claimed in claim 3, wherein the polarization beam combining element is a beam combining four-prism, the beam combining four-prism has a light incident surface, a light emergent surface and a joint surface connected with the reflecting element, a beam combining layer is arranged on a diagonal surface of the beam combining four-prism intersecting the light incident surface and the joint surface in a straight line, and the light emergent surface of the beam combining layer is the beam combining surface; the reflecting element is a right-angle triangular prism, one right-angle surface of the right-angle triangular prism is a light incident surface, the other right-angle surface is connected with the connecting surface of the beam combining four-prism, a reflecting layer is formed on the inclined surface of the right-angle triangular prism, and one surface of the reflecting layer, which is close to the beam combining surface, is the reflecting surface;
or the polarization beam combining element is a beam combining prism, one surface of the beam combining prism is a light incident surface, a beam combining layer is arranged on an inclined surface connected with the light incident surface, and the light emergent surface of the beam combining layer is the beam combining surface; the reflecting element is a parallelogram prism, one surface of the parallelogram prism is a light incident surface, one surface of the parallelogram prism, which is connected with the light incident surface and is close to the beam combining triple prism, is connected with the beam combining surface, a reflecting layer is formed on one surface, which is parallel to the beam combining surface and is arranged opposite to the beam combining surface, and one surface, which is close to the beam combining surface, of the reflecting layer is the reflecting surface.
5. The transmitting module of claim 3, wherein the polarization beam combining element and the reflecting element are made of the same material.
6. The transmitting module of claim 3, wherein the two sides of the polarizing beam combining element and the reflecting element are identical in shape and size.
7. The emission module as claimed in claim 1, wherein the collimating lens has a spherical or aspherical surface.
8. The emitter module of claim 1, wherein said quartz wire has a diameter of 100-300 μm and a length of 0.5-5mm.
9. The emissive module of any of claims 1-8, wherein the width of the first light ray and the width of the second light ray are the same in the slow axis direction.
10. A lidar comprising a receiving module and a transmitting module according to any of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223125441.3U CN219302659U (en) | 2022-11-22 | 2022-11-22 | Transmitting module and laser radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223125441.3U CN219302659U (en) | 2022-11-22 | 2022-11-22 | Transmitting module and laser radar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219302659U true CN219302659U (en) | 2023-07-04 |
Family
ID=86956885
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223125441.3U Active CN219302659U (en) | 2022-11-22 | 2022-11-22 | Transmitting module and laser radar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219302659U (en) |
-
2022
- 2022-11-22 CN CN202223125441.3U patent/CN219302659U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2022028496A1 (en) | Optical system of laser radar and laser radar system | |
| US11960031B2 (en) | Laser measurement module and laser radar | |
| US20210341610A1 (en) | Ranging device | |
| CN210015229U (en) | Distance detection device | |
| CN116224298B (en) | Lidar and mobile device | |
| WO2021143665A1 (en) | Prism and multi-line lidar | |
| CN113625295A (en) | Optical system for laser radar and laser radar | |
| CN219302659U (en) | Transmitting module and laser radar | |
| CN108627983B (en) | Laser beam combining system and beam combining method thereof | |
| CN219285407U (en) | Transmitting module and laser radar | |
| US20210341588A1 (en) | Ranging device and mobile platform | |
| CN214473947U (en) | Laser ranging system without mechanical motion scanning | |
| CN112103768A (en) | Semiconductor laser | |
| CN115047428A (en) | Laser radar | |
| US6701093B1 (en) | Integral transmitter-receiver optical communication apparatus and a crosstalk preventive device therefor | |
| CN110703450A (en) | Beam shaping assembly, module and laser module | |
| CN112731420B (en) | Laser ranging system without mechanical movement scanning | |
| CN219284994U (en) | Compact high-sensitivity gas detector | |
| CN217543377U (en) | Detection device | |
| WO2023116918A2 (en) | Laser radar transmitting system and laser radar apparatus | |
| CN219392270U (en) | Optical system based on laser radar transmitting unit and laser radar | |
| CN210666015U (en) | Transmitting light path device for MEMS laser radar | |
| CN216979291U (en) | Optical system of laser radar and laser radar | |
| CN218727982U (en) | Light path structure and mixed solid-state laser radar | |
| WO2022188687A1 (en) | Detection apparatus, detector, laser radar, and terminal device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |